Apparatus and method for inserting one or more goods into a moveable cover

ABSTRACT

An apparatus for inserting one or more goods into a moving cover includes a cover transport, and at least one separating device configured to engage with a first part of the cover and to maintain the first part of the cover separate from a second part of the cover during at least a part of the movement of the cover.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of copending International Application No. PCT/EP2011/057338, filed May 6, 2011, which is incorporated herein by reference in its entirety, and additionally claims priority from European Application No. EP 10162320.5, filed May 7, 2010, and U.S. Application 61/332,338, filed May 7, 2010, which are all incorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION

Embodiments of the invention relate to the field of inserting goods into covers, more specifically to a separating device in an apparatus for inserting one or more goods into a moveable cover, for example an envelope.

In the art various approaches for inserting one or more goods into a cover, such as an envelope, are known. In accordance with one approach during the filling process an envelope is stopped and only the goods are moved to be inserted into the envelope. The problem with this kind of inserters is that they operate in a start/stop mode meaning that when filling the one or more goods the envelope needs to be stopped and, after completing the filling process, the envelope is moved out of the filling position and a following envelope is arranged in the filling position and stopped again to allow filling the one or more goods into this new envelope. The problem with this kind of inserter is that the throughput, i.e., the number of envelopes that can be filled with one or more goods during a predetermined period of time, for example within an hour, is limited due to the necessity of decelerating, stopping and accelerating the envelopes during the filling process. Further, the mechanical wear and stress of the respective parts of the inserter, the goods and/or the envelopes is quite high.

Another approach for inserting one or more goods into a cover is to move both the one or more goods and the cover during the filling process. Such an approach is e.g. described in DE 42 05 197 A1, WO 94/27832 A1, U.S. Pat. Nos. 4,525,986 A, 3,858,381 A, 4,817,368 A, 5,430,990 A and WO 2002/096670 A1. The transport directions of the one or more goods and an envelope extend parallel in the same direction, however, the filling process is such that the one or more goods, the envelope or both are moved angular with respect to the transport direction towards each other. At the beginning of a filling path the envelope and the one or more goods travel side by side with the one or more goods and/or the envelope being moved angular towards each other. Eventually, the goods and the envelope meet such that due to the angular movement of the goods, they are filled into the envelope. In case filling pockets are used for each of the goods, as e.g. described in WO 94/27832 A1 or U.S. Pat. No. 5,430,990 A, a plurality of individual pockets are necessitated, which need to be returned to the starting point so that an additional transport is needed which increases the number of necessitated parts even further as well as the costs. Yet another problem of this kind of filling process are the high kinematic forces that are applied to the envelope and the goods due to the angular transport. Further, the necessity to provide parallel transports for the goods and for the envelope increases the costs, for example due to the fact that at each position respective guidings are necessitated. In terms of the necessitated installation space, quite a lengthy set up is necessitated as well as additional space for placing two transports in parallel. Also the time and efforts for changing the format is high (e.g. it is necessitated to modify a plurality of elements of the pockets for adjustment to the new format) and, basically, these approaches are not flexible with regard to the format processed. In addition, due to the many parts that move, the operation of the device is quite noisy.

Yet another approach teaches to move the one or more goods and the cover or envelope along a common filling or inserting path in such a way that the envelope is moved at least a little bit slower than the one or more goods so that along the filling path the one or more goods eventually “overtake” the envelope, however, since the envelope has its envelope throat opened, this process results in the filling of the goods into the envelope. Such an approach is, for example, described by U.S. Pat. No. 3,423,900 or EP 1 418 840 A1. In accordance with these approaches during the filling process the envelope is moved continuously along the filling path, wherein the transport of the envelope along the filling path is achieved by filling elements that are provided on both sides of the filling path and engaged with the lateral inside edges of the envelope body. However, the filling elements are inserted into the stopped envelope and moving the filling elements along the inserting path will cause the transport of the envelope along the inserting path. The drawback of this approach is that the filling elements cause the transport of the envelope so that a precise placement of these envelopes onto the filling elements is necessitated. Therefore, handling of the envelopes becomes difficult in case of deviations in the format, e.g. due to manufacturing tolerance which may be in the range of about 1.5 mm. Such tolerances in the width direction of the envelope result in the envelope to be either clamped on the filling elements or to be held by the filling elements loosely; in either case no reliable transport of the envelopes is possible. In case a clamping occurs the removal of the filled envelope from the filling elements is difficult. Further, it is not possible to actively decelerate the transport mechanism as this would result in the envelopes to slide off the filling elements. Also, there is no flexibility allowing for an easy change of the formats processed. Yet another problem with the approach of U.S. Pat. No. 3,423,900 or EP 1 418 840 A1 is that, as mentioned above, tolerances of the dimensions of the envelopes are not considered. Since the filling elements will also provide for the transport of the envelope they need to be adjusted dependent on the envelope. A further disadvantage is that removal of the envelope from the filling element by the goods transport is difficult in case the goods comprise only a single sheet of paper. In this case, the force applied by the goods transport may damage the sheet before a movement of the envelope by the filling element is started. Further, there is no possibility control how far the filling element moves into the envelope, e.g. dependent on the thickness of the goods, rather independent of the thickness of the goods to be inserted, the filling element has to be inserted completely into the envelope, i.e., it is inserted up to a fixed position so that the envelope is spanned irrespective of the thickness of the goods to be inserted. Further, in accordance with EP 1 418 840 A1 an envelope flap is held by a suction rail which decelerates the envelope so that it is maintained in contact with the filling element, however, there is no control or regulation possible. Further, there are difficulties when removing the filled envelope using the goods transport, since the provision of the additional suction rail and the decelerating action thereof necessitates to apply a high force to the envelope for removing it from the filling elements which, naturally, results in damages and possible jams even after the filling process has already been completed. Further, this approach necessitates high mechanical efforts, for example due to the necessitated mechanical coupling of all drives via a single main shaft.

Another problem with approach described in U.S. Pat. No. 3,423,900 or EP 1 418 840 A1 is that a central portion of the envelope sags because filling elements engage with the opposite lateral edges of the envelope. In case of larger formats, e.g. formats having a large lateral dimension, this is a serious problem as the one or more goods to be inserted may collide with the sagging envelope side resulting in jams so that no reliable filling is possible.

Yet another problem with approach described in U.S. Pat. No. 3,423,900 or EP 1 418 840 A1 is that the goods and the envelope are moved so that it is necessitated to carefully control the motion of each element to avoid a gap between a leading edge of the goods and an edge of an envelope flap. In case such a gap is generated the goods and the envelope flap may collide. This is a problem being specifically problematic with short flaps.

SUMMARY

According to an embodiment, an apparatus for inserting one or more goods into a moving cover may have: a cover transport; and at least one separating device configured to engage with a first part of the cover and to move together with the moving cover during at least a part of its movement for maintaining the first part of the cover separate from a second part of the cover during at least a part of the movement of the cover, wherein the separating device is configured to move along at least a section of a path in the direction along which the cover and the one or more goods are moveable along the path so as to engage with the first part of the cover as the cover moves.

According to another embodiment, an apparatus for inserting one or more goods into an envelope, wherein the envelope includes a first side including an envelope flap, and a second side being opposite to the side having the envelope flap, may have: a path along which an envelope and one or more goods to be inserted can be moved, wherein the path is arranged to move the one or more goods with a faster velocity than the envelope; an envelope transport; and at least one separating device configured to engage with a first part of the envelope and to move together with the moving envelope during at least a part of its movement for maintaining the first part of the envelope separate from a second part of the envelope during at least a part of the movement of the envelope.

According to another embodiment, a method for inserting one or more goods into a moving cover may have the steps of: moving a cover; and moving at least a separating device together with the moving cover during at least a part of its movement for such that the separating device engages a first part of the moving cover and holds the first part of the cover separated from a second part of the cover during at least a part of the movement of the cover, wherein the separating device is moved along at least a section of a path in the direction along which the cover and the one or more goods are moved along the path so as to engage with the first part of the cover as the cover moves.

Embodiments of the invention provide an apparatus for inserting one or more goods into a moving cover, comprising: a cover transport; and at least one separating device configured to engage with a first part of the cover and to maintain the first part of the cover separate from a second part of the cover during at least a part of the movement of the cover.

Embodiments of the invention provide a method for inserting one or more goods into a moving cover, comprising: moving a cover; and moving at least a separating device such that the separating device engages a first part of the cover and holds the first part of the cover separated from a second part of the cover during at least a part of the movement of the cover.

Thus, in accordance with embodiments, the filling process is such that a goods transport receives the inserts directly from a collating track. An envelope may be located in a gripper transport and opened by blow air before or as it enters the filling area or the filling path. The envelope is transported into the filling path, in accordance with embodiments, from underneath with the gripper transport and, advantageously, the filling process is “hinge line”-oriented (the hinge line is the line where the envelope flap is connected to the envelope body), i.e. the filling process starts when the leading edge of the goods reached the hinge line of the envelope, e.g. a leading edge of the inserts, filling fingers, separating elements etc. When moving into the filling path, the envelope is opened by the blow air provided by air nozzles arranged in front of the filling path. The flap of the envelope may be controlled so that it does not collide with the inserts to be inserted, for example by sheet metal stripes laying on the flap while the envelope is moved into the filling path may be provided. Filling fingers are moved into the opened envelope and the filling process starts when the filling fingers have been moved into the opened envelope and a leading edge of the insert is positioned at the hinge line.

Embodiments of the invention describe a system in which a filling process is a “continuous process”. This means that the envelope (the cover) and the insert (the one or more goods) are moved together in the same direction but with different speed levels so that due to this difference in speed levels the goods or inserts are eventually transported into the envelope. This approach is advantageous because in the filling area or along the filling path, several processes may take place in parallel. For example, the filling process of a first envelope along the filling path may not yet be finished, but an opening and filling process of a subsequent envelope may already have been started so that for each process step more time is available. At the same time the throughput can be increased due to the parallel operations. Further, the mutual relative movement of the inserts and envelopes allows for a relatively low filling speed even at high cycle speeds. Due to the low filling speeds a careful treatment of the inserts is guaranteed.

Contrary to conventional approaches, in accordance with the inventive approach, the filling fingers are only for guiding the inserts into the envelope, but they are not provided for causing a transport of the envelope along the filling path. Rather, an additional envelope transport is provided, for example a suction belt that may be configured to keep the envelope and the flap down on its rear side and to move the envelope along the filling path. The suction belt transport may have the same speed or a speed higher than the filling fingers so that the transport is effected only by the envelope transport but not by the filling members. The insert is moved into the opened envelope due to the higher speed of the goods transport when compared to the speed of the envelope transport, the speed of the filling fingers and the speed of the separating device.

In accordance with embodiments of the invention collisions with the envelope side wall or an envelope window, if present, are avoided due to the lateral filling fingers. Further, the filling fingers may overcome an inner envelope adhesion, i.e., the adhesion of the two sides of the envelope, which may be due to excess adhesive during the envelope manufacturing process. Once the filling process is completed, the suction belt transport positioned at the bottom is switched off and an active output transport with a speed being equal or higher than the filling slide transport, gets into contact with the filled envelope and retracts it off the lateral filling guides and moves it out of the filling path.

Further, a separating device for guiding the envelope is provided, e.g. on a circulating transport. The separating device may be provided for supporting the process of envelope opening and/or keeping the envelope open during filling. It may be arranged above the envelope transport and engages with a part of the envelope thereby avoiding sagging of the envelope so that the envelope cut and the envelope throat are protected from a collision with the inserts during the filling process.

In accordance with embodiments a flap holder is provided such that no gap between a leading edge of the goods and an edge of an envelope flap is generated so that control of the goods and the envelope which are moved simultaneously is easier and collisions between a leading edge of the goods and an edge of an envelope flap are avoided, thereby ensuring a reliable filling process.

Embodiments of the invention provide an apparatus for opening an envelope and an inserter for inserting a goods into the envelope along an inserting path, comprising a transport arranged above the inserting path, and at least one opening element that is arranged at the transport, wherein the opening element is movable by the transport along the inserting path such that the opening element engages the envelope to separate an envelope front side and an envelope back side. The transport may comprise a first portion along which the opening element is moved into the inserting path, wherein the transport and/or the opening element are adapted such that the opening element, upon entering into the inserting path, passes a position which is below a plane in which the filling path is arranged so that the opening element initially engages an envelope front side and/or an open flap of the envelope thereby supporting opening of the element.

When compared to the above-described conventional approaches, the inventive approach is advantageous. With regard to the inserters operating in accordance with the start/stop approach embodiments of the invention provide for an inserter and a filling process which is faster, yet resulting in less wear and less stress for of the goods and the envelopes during filling.

Further, when compared to the approaches providing for the continuous lateral filling process, the inventive approach is advantageous as it is flexible with regard to the formats to be used and changing between respective formats is much simpler. It is less costly because less parts are needed and the necessitated space for installation is smaller as the decisive dimensions for the installation space are the longitudinal sides of the envelope. Since the envelopes and the goods are transported in line (not angular), the number of envelopes and goods that need to be transported simultaneously along the filling path is smaller. Also, a faster filling is achieved. Also, the kinematic is reduced as the envelope and the goods are transported in line which, in turn, results in a higher process security.

When compared to the approach described in U.S. Pat. No. 3,423,900 or EP 1 418 840 A1, the inventive approach is advantageous as a separate transport for the covers or envelopes is provided, i.e., the transport of the envelopes is achieved independently of any other element engaging with the envelope, e.g. the filling fingers, the separation device or the flap holder, so that the transport may reliably handle envelopes having different dimensions due to tolerances. Further, both the one or more goods and the envelope can be actively decelerated. The envelope is transported separately from the filling elements which allows to use separate drives. Yet a further advantage of the inventive approach is that a secure separation of the two sides of the envelope is obtained and that, at the same time, the inserting of the goods is supported and is guided and any collision with the edges of the envelope are avoided. Moreover, since the envelope is not held by the filling element, it is possible to actively remove the filling element after or during the filling process. The filling finger can be moved into the envelope dependent on the goods to be inserted, i.e., the envelope is only opened as it is necessitated for receiving the goods. It is not necessitated to accelerate the envelope and the goods at the end of the process, rather due to the separate drives it is possible, for example, to slow down the filling elements so that the filled envelope leaves the filling element. Yet another advantage of the inventive approach is that the envelope transport may be actively controlled independent of the elements.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will be detailed subsequently referring to the appended drawings, in which:

FIG. 1 is a schematic representation of an inserter in accordance with embodiments of the invention;

FIG. 2 shows a sectional view of the inserter taken along the line 2-2′ in FIG. 1;

FIGS. 3(a) to 3(h) show the filling process in accordance with embodiments of the invention, wherein FIGS. 3(a) to 3(h) are representations of an inserter as described in FIG. 1 and FIG. 2 during the filling process;

FIG. 4 is a partial top view of the inserter of FIG. 1 using three suction belts a instead of a single suction belt;

FIGS. 5(a), 5(b), 6, and 7 show gripper conveyors in accordance with different embodiments of the invention;

FIG. 8 shows a schematic representation of an embodiment allowing the positioning of an envelope such that its flap is arranged away from the envelope transport;

FIG. 9 is a schematic top view of the inserter similar to the one in FIG. 1 describing a filling aid in accordance with an embodiment of the invention;

FIG. 9(a) illustrates the placement of the filling fingers inside the envelope for a thin insert;

FIG. 9(b) illustrates the placement of the filling fingers inside the envelope for a thick insert;

FIGS. 10(a) and 10 b) show an enlarged view of a front part of the filling path of the inserter of FIG. 1, wherein FIG. 10(a) is a schematic top view, and FIG. 10(b) is a sectional view taken along line b-b′;

FIGS. 11(a) and 11(b) show the filling process at a position downstream from the position in FIG. 10, wherein FIG. 11(a) is a top view, and FIG. 11(b) is a view taken along line b-b′ in FIG. 11(a);

FIGS. 12(a) and 12(b) show a situation even further down the filling path from the position in FIG. 11 where the filling process has been completed, wherein FIG. 12(a) is a top view, and FIG. 12(b) is a sectional view taken along line b-b′;

FIGS. 13(a) and 13(b) show yet another embodiment of the filling aid;

FIG. 14 shows a first envelope having a first width and a filling finger inserted;

FIG. 15 shows a second envelope having a second width and a filling finger inserted;

FIG. 16 shows an initial situation of the filling process using at least one separating device according to embodiments of the invention, where an envelope is already transported by the envelope transport, but the goods have not yet reached the hinge line of the envelope;

FIG. 17 shows a situation where the envelope, the goods and the claws have been moved further in the transport direction when compared to FIG. 16;

FIG. 18 shows a situation where the envelope, the goods and the claws have been moved even further in the transport direction when compared to FIG. 17;

FIG. 19 shows a situation in which the filling process is almost completed;

FIG. 20 shows the situation where the filling process has been completed and transport of the envelope has been taken over by the goods transport;

FIG. 21 shows a separating device according to another embodiments of the invention;

FIGS. 22(a) and 22(b) show a separating device according to yet another embodiments of the invention;

FIG. 23 shows a flap holder in accordance with embodiments of the invention configured to cover an envelope flap during at least a part of the movement of the envelope in an inserter as is it is shown in FIG. 1;

FIGS. 24(a) and 24(b) show further embodiments of the flap holder, wherein FIG. 24(a) shows a flap holder having six flap holder elements, and wherein FIG. 24(b) shows another embodiment comprising only two flap holder elements;

FIGS. 25(a) to 25(c) show an embodiment using stationary flap holder elements, wherein FIG. 25(a) shows an initial situation in which an envelope has been fed to the envelope transport, wherein FIG. 25(b) shows a situation where the envelope and the goods are moved through a transfer area, and wherein FIG. 25(c) shows a situation where the envelope and the goods have left the transfer area;

FIGS. 26(a) to 26(c) show an embodiment using movable flap holder elements, wherein FIG. 26(a) shows an initial situation in which an envelope has been fed to the envelope transport, wherein FIG. 26(b) shows a situation where the envelope and the goods are moved through a transfer area, and wherein FIG. 26(c) shows a situation where the envelope and the goods have left the transfer area;

FIGS. 27(a) and 27(b) show a flap holder in accordance with another embodiment of the invention.

FIG. 28 shows adjustable flap holders in accordance with an embodiment;

FIG. 29 shows another embodiment of the flap holder comprising flap holder elements which can travel together with the envelope along the filling path;

FIGS. 30(a) and 30(b) show an embodiment comprising an additional envelope transport, wherein FIG. 30(a) is a schematic top view, and FIG. 30(b) is a sectional view taken along line b-b′;

FIG. 31 shows another embodiment of the additional envelope transport;

FIG. 32 shows yet another embodiment of the additional envelope transport; and

FIG. 33 shows a schematic representation of an alternative embodiment for realizing the filling fingers.

DETAILED DESCRIPTION OF THE INVENTION

In a subsequent description of embodiments of the invention the same elements or elements having the same functionality will be provided with the same reference numbers. In the following, different aspect in accordance with embodiments of the invention will be described.

FIG. 1 is a schematic representation of an inserter in accordance with embodiments of the invention. FIG. 1 is a top view of the inserter which comprises an envelope transport 100 comprising a suction belt 102 having first portions 104 ₁ and 104 ₂ where the suction belt 102 is provided with openings so that a suction force can be applied by a vacuum mechanism provided beneath the suction belt 102 to an object arranged on the suction belt 102. Further, the suction belt comprises second portions 106 ₁, 106 ₂, 106 ₃ where no holes are provided so that in this part of the suction belt no suction force is applied to an object arranged thereon. The suction belt 102 further comprises elevations 108 ₁ and 108 ₂ which are thicker (in the direction vertical to the plane of the drawing) than the portions 104 and 106. In accordance with embodiments, the elevations 108 are ramp-shaped so that the elevation raises along the transport direction F. Also other shapes of the elevations are possible. The envelope conveyor 100 is provided to transport the respective envelopes E₁ and E₂ using the suction belt 102. The envelopes are placed on the suction belt 102 such that an envelope main body is only partly arranged in the first portion 104 ₁, 104 ₂, however, the respective flaps F₁ and F₂ are arranged adjacent to the elevations 108 ₁, 108 ₂ and completely on the first portions 104 ₁, 104 ₂ thereby being held by the suction force applied through the openings in section 104 ₁, 104 ₂. This ensures that the flaps F₁ and F₂ are held on the suction belt. The ramp-shaped elevations 108 ₁, 108 ₂ cause the goods to slightly raise from a transport level in which the envelope is moved so that the flaps may securely be passed without any collision.

The envelope transport 100 is provided to move one or more envelopes E₁, E₂ along an inserting path or filling path which starts where an envelope E₁ and one or more goods G₁, for example one or more sheets of paper, start to overlap and which ends when the goods are completely inside the envelope E₁. FIG. 1 shows a further envelope E₃ that already left the filling path and into which the goods G₃ have already been inserted. Further, goods G₄ are depicted at the left-hand side of FIG. 1 which are currently forwarded towards the inserter to be inserted into an envelope following envelope E₁. The envelopes E₁ to E₃ are shown at different stages of the inserting process and, as can be seen, all envelopes have their flaps F₁ to F₃ open so that the goods G₁ to G₃ can be filled into the envelope. Envelope E₁ is at the beginning of the filling path and the goods G₁ already passed the flap F₁ and the leading edge of the goods is inside the envelope. Due to the different speeds with which the envelope and the goods are moved, along the filling path the goods are filled into the envelopes. Envelope E₂ has already received the major part of the goods G₂ and the rear or trailing edge of the goods has passed the edge of the flap F₂. Envelope E₃ is already filled with the goods G₃ which have completely passed the flap F₃ and are inside the envelope E₃, i.e. a leading edge of the goods reached the bottom of the envelope.

The inserter shown in FIG. 1 further comprises a goods transport 200 comprising a plurality of pairs of pushers 202 a, 202 b for engagement with the goods G₁ to G₄. The goods transport 200 moves the goods with a velocity higher than the envelope transport 100. The goods and the envelopes are transported in the same transport or conveying direction F. The openings of the envelopes are arranged lateral or perpendicular to the transport direction F so that the movement of the envelopes and the goods in line along the same direction F results in the filling of the goods into the envelopes. The goods transport comprises the pair of pushers 202 a and 202 b which engage with the respective trailing edges of the goods G₁ to G₄, advantageously at positions symmetrically to a center of the goods. Further, the goods transport 200 is longer than the envelope transport 100, i.e. it starts in front of the filling path and extends beyond the filling path. The goods transport 200 may also provide for a removal of the filled envelope E₃ out of the filling path towards a subsequent processing station or a subsequent transport.

The inserter further comprises a filling aid 300 comprising a first conveyor 302 having a first, driven roller 304 and a second roller 306 around which a chain or belt 308 extends. At predetermined intervals along the chain 308 a plurality of filling aid elements or filling fingers 310 are provided. The first conveyor 302 is arranged such that the filling elements 310 are moved in the conveying direction F on a side of the conveyor facing the envelope transport 100 and are moved in the opposite direction on the side facing away from the transport 100, i.e., the filling finger 310 move along the filling path and are returned from the end of the filling path to the beginning of the filling path. The filling aid 300 further comprises a second conveyor 312 having a similar structure as the first conveyor. The second conveyor 312 comprises a driven roller 314, a further roller 316 and a chain or belt 318 extending around the rollers 314, 316. Respective filling aid elements or filling fingers 320 are arranged at the chain or belt 318. The filling fingers 320 are moved in the conveying direction F on the side of the chain 318 facing the envelope transport 100, and are returned from the end of the filling path in the opposite direction back towards the beginning of the filling path. The driven rollers 304 and 314 may be driven by the same drive or motor so that the two conveyors operate in synchronism with each other. The filling fingers 320 are provided to be moved by a predetermined distance into the envelopes E₁ and E₂. More specifically, as is shown with respect to envelope E₁, the filling fingers 310, 320 are arranged partially inside the envelope E₁ and the goods G₁ are guided by the filling fingers into the envelope E₁, thereby avoiding collisions between the side edges (along the transport direction) of the goods and the side edges (along the transport direction) of the envelope.

In accordance with embodiments the filling fingers 310, 320 comprise a lower part 310 a, 320 a, an upper part 310 b, 320 b and a vertical element 310 c, 320 c connecting the upper and lower parts of the respective filling elements 310, 320. The upper and lower elements 310 a, 320 a, 310 b, 320 b may be moveable with respect to each other (e.g. the lower part may be fixed and the upper part can be moved) so as to move relative to each other dependent on the thickness of the goods G₁ to G₄ to be inserted thereby adapting to the thickness of the goods to be inserted. The filling fingers 310, 320 may become narrower towards the forward end in the conveying or transport direction of the elements 310, 320.

The conveyors 302 and 312 are arranged at a distance from each other which depends from the goods G₁ to G₄ to be inserted but not dependent on the lateral dimension of the envelopes E₁ to E₃. The filling fingers 310, 320 are arranged at a distance defined by the goods and are inserted into the envelopes only to avoid collisions of the goods with the envelope, however, the filling fingers 310, 312 do not perform any transport operation of the envelopes E₁, E₂ along the filling path. The transport of the envelopes is only provided by the envelope transport 100. Therefore, in accordance with embodiments the filling elements 310, 320 are moved by the conveyor 302, 312 with a velocity that is equal to or slower than the speed with which the envelopes are moved by the transport 100. The conveyors 302 and 312 may be moved lateral with respect to each other so as to adjust the distance between the filling elements 310, 320 easily dependent on the dimensions of the goods to be inserted, i.e., the filling fingers 310, 320 are adjusted independent of any format of the envelope and are, therefore, independent and not influenced by possible format tolerances of the envelope. Since the filling fingers 310, 312 are set with respect to the goods to be filled but not with respect to the format of the envelope, a filled envelope E₃ can be easily removed from the filling fingers 310, 320.

FIG. 1 further shows two separating claws 402 of a separating device described in further detail with regard to FIG. 2. The separating claws 402 engages with the trailing edge of a side of the envelope E₁ that is opposite to the side to which the flap F₁ is attached. The separating claws 402 are arranged such that the envelope is held open along the inserting path, i.e., the two sides of the envelope are separated and collisions between the goods and the upper side of the envelope are avoided, e.g. in situations where the center part of the upper side of the envelope would sag without any support.

The functionality of the inserter depicted in FIG. 1 is as follows. An envelope E₁ is received by the envelope transport 100 from an envelope feeder and is transported along the filling path with a first velocity. At the same time, goods G₁ are moved by the goods transport 200 also along the filling path, however, with a velocity higher than the velocity by which the transport 100 moves the envelope E₁. Also, the filling elements 310, 320 are moved into the filling path and are placed by a predetermined distance into the envelope. The velocity of the filling fingers 310, 320 is equal to or less than the transport speed of the envelope transport 100. As the envelope E₁ is moved down the filling path, due to the velocity of the goods G₁ being higher than the velocity of the envelope, the goods G₁ are inserted and collisions between inserts and the envelope are avoided by the filling fingers 310, 320 acting as the guides so that eventually, as is shown in FIG. 1 for envelope E₂, the goods are filled into the envelope. At the end of the filling path the goods are completely filled into the envelope, i.e., their leading edge reached a bottom of the envelope. At the end of the filling path the envelope is released from the envelope transport 100 and is conveyed or advantageously transported in the direction F by means of the goods transport 200 which is still in engagement with the goods (see envelope E₃). Since the velocity of the goods transport 200 is higher than the velocity by which the filling fingers 310, 320 are moved, the filled envelope E₃ is removed from the filling fingers 310, 320 and is trans-ported towards an output of the inserter.

While FIG. 1 depicts an inserter in which two envelopes are arranged along the filling path at the same time, it is noted that the invention is not limited to such embodiments. The inventive principles may be equally applied to an inserter processing only a single envelope along the filling path, alternatively also more than two envelopes may be provided along the inserting path.

FIG. 2 shows a sectional view of the inserter of FIG. 1 taken along the line 2-2′.

FIG. 2 shows further details of the envelope transport 100, the goods transport 200 and the separating device 400. The goods transport 200 comprises a first, driven roller 204 and a second roller 206 arranged at a distance from the end of the filling path and the beginning of the filling path, respectively. A belt or chain 208 extends around the rollers 204, 206 which carries a plurality pushers 202 a. A similar structure is arranged symmetrically with respect to a longitudinal center of the inserter for moving the pusher elements 202 b but is not shown in FIG. 2. The driven rollers of the two belts may be provided with the same drive which is operated independent of the drives of the envelope transport 100 and the conveyors.

The envelope transport 100 comprises a first, driven roller 110 and a second roller 112 around which the suction belt 102 extends. The envelope transport 100 further comprises a vacuum chamber 114 that extends partly between the rollers 110 and 112 for applying a suction force to the sections 104 of the suction belt as the respective sections 104 are moved across the vacuum chamber 114. The vacuum chamber 114 extends from the roller 112 along the conveying direction F towards the roller 110, however, there is a gap between the end of the vacuum chamber 114 and the roller 110 so that in this area no suction force will be applied to an envelope, i.e., at this point the envelope will be released from the envelope transport 100.

FIG. 2 further shows a separating device 400 comprising a first, driven roller 404 and a second roller 406 as well as a belt or a chain 408 extending around the rollers 404, 406 to which the respective separating claws 402 are mounted.

The device further comprises a pair of blow nozzles 500 arranged at the beginning of the filling path and provided for blowing air towards an envelope that was received by the envelope transport 100, thereby opening the envelope. Further, a surface 502 formed of a plate or one or more stripes is provided that extends in front of the filling path, wherein an envelope—when being fed to the filling path—passes beneath the surface 502, and wherein the goods on the way to the filling path move above the surface 502.

Subsequently, the filling process will be described in further detail on the basis of FIG. 3 showing in FIG. 3(a) to (h) representations of an inserter as described in FIG. 1 and FIG. 2 during the filling process. In FIG. 3(a) the envelope E₁ has been supplied from an envelope feeder that may be arranged beneath the filling path and received at the envelope transport 100 (see FIG. 1 and FIG. 2). The envelope E₁ has been opened by the blowers 500 (see FIG. 2) and a leading edge of the goods G₁ has been positioned at the hinge line HL and the filling process starts. The filling fingers 310, 320 have been moved such that a leading edge thereof is inside the envelope E₁, and the separation claw 402 has been brought into engagement with the upper side of the envelope E₁. In accordance with embodiments a center part of the flap of an envelope is held by the envelope transport, however, the part of the flap not held may rise so that a collision with goods to be inserted may occur. To avoid this, the inserter may further comprise a flap holder 504, e.g. metal stripes 504 a-504 d. Two stripes 504 a, 504 b are provided on one side of the envelope transport 100, i.e. between the envelope transport 100 and the first conveyor 302 of the filling aid 300. Two stripes 504 b, 504 c are provided on the other side of the envelope transport 100, i.e. between the envelope transport 100 and the second conveyor 312 of the filling aid 300. The metal stripes 504 a-504 d hold the flap F₁ of the envelope E₁ down in a region between the envelope transport 100 and the respective conveyors 302, 312 of the filling aid 300 so that the goods G₁ do not collide with the flap F₁ in this portion. Further, the inserter comprises an output transport 506 for moving a filled envelope towards an output of the inserter. In FIG. 3(a) also the envelopes E₂ and E₃ are shown, of which envelope E₂ has almost been filled and which is positioned along the filling path downstream of envelope E₁. Envelope E₃ has been completely filled and has been transferred to the output transport 506. The suction belt (not shown in FIG. 3) is switched on, i.e. vacuum is applied, so that the envelope E₁ is held by the suction belt and will be transported as the suction belt moves. The pushers 202 a, 202 b of the goods transport 200 have engaged the goods G₄ for a subsequent filling process which have already been received from a collating track upstream of the inserter.

In FIG. 3(b) the envelope E₁ has traveled down the filling path and the goods G₁ have begun to be filled into the envelope E₁. Envelope E₂ has been completely filled and will be transferred to the output transport 506, and envelope E₃ almost reached the output. Also, the transport of a new envelope into the filling path has begun.

In FIG. 3(c), envelope E₃ has been removed from the inserter and envelope E₂ is now transported by the output transport 506 towards the output of the inserter. The filling of the envelope E₁ is in progress, i.e. the inserts G₁ are moved towards the bottom B of the envelope E₁. The new envelope E₄ has been received at the beginning of the filling path and is transported by the envelope transport. The goods G₄ have not yet reached the beginning of the filling path, and the filling fingers 310, 320 start to pivot into the filling path.

FIG. 3(d) to FIG. 3(g) illustrate how the start position for the filling process is reached by the envelope E₄, the goods G₄ and filling fingers 310, 312 so that finally a position as in FIG. 3(h) is reached. Following the situation depicted in FIG. 3(h) a situation as in FIG. 3(a) is reached. At the same time, envelope E₁ is completely filled and ready to be transferred to the output transport 506, while envelope E₂ reaches the output of the inserter.

Thus, in the filling process of FIG. 3 the goods transport receives the goods from a collating track. The envelope may be fed by a gripper transport of an envelope feeder towards the filling path and opened by blow air. The envelope may be transported from underneath using the gripper transport. When moving into the filling path, the envelope is opened by the blow air and the flap may be controlled by means of sheet metal stripes laying on the flap. The revolving lateral filling fingers 310, 320 are moved into the opened envelope and the filling process starts when the lateral filling fingers have been moved at least partially into the envelope and the leading edge of the goods is positioned at the hinge line. The suction belt transport keeps the envelope and the flap down and moves the envelope through the filling path. The suction belt has the same speed or slower as the revolving lateral filling fingers and has an adjustable switch on/switch off point for the suction area dependent on the format of the envelope. The goods transport moves the goods into the opened envelope due to the different speed of the goods transport when compared to the speed of the suction belt transport. Once the filling process is completed, in accordance with embodiments, the suction belt transport is switched off and an active transport having a speed equal to or higher than the goods transport takes over the filled envelope which draws it from the lateral filling fingers 310, 320 and moves it out of the filling area.

In FIG. 1 the envelope transport 100 comprises a single suction belt. However, the invention is not limited to such a configuration. Also, a plurality of suction belts may be used as is shown in FIG. 4 showing a partial top view of the inserter of FIG. 1. Instead of providing a single suction belt, three suction belts 102 a, 102 b and 102 c are provided side by side and extending in parallel along the conveying direction F. The suction belts 102 a to 102 c are of the same structure as suction belt 102 described above. The suction belts 102 a, 102 b and 102 c are arranged at a distance in a lateral direction of the respective envelopes such that the first pusher 202 a of the goods transport 200 is arranged between the first and second suction belts 102 a and 102 b and such that the second pusher 202 b of the goods transport 200 is arranged between the second suction belt 102 b and the third suction belt 102 c. It is noted that two suction belts or more than three suction belts may also be used.

Further, it is noted that the invention is not limited to the use of suction belts, rather any kind of conveyor may be used, advantageously a conveyor that engages with the exteri- or of the envelope, for example from above or from below. FIG. 5(a) shows an example of a gripper conveyor 600 comprising a first roller 601 and a second roller 602 as well as a belt or a chain 604 extending around the rollers 601, 602. The chain comprises a gripper element 606 for engagement with a leading edge 608 of an envelope E₁ so that the envelope is held at its leading edge 608 and moved as the gripper element 206 is moved by the belt 604. FIG. 5(b) shows a top view of the gripper conveyor.

As is shown in FIG. 6, instead of a single gripper conveyor as shown in FIG. 5, two or more gripper conveyors, e.g. two conveyors 604 a and 604 b, may be provided engaging by means of respective elements 606 a and 606 b at different positions along the leading edge 608 of the envelope E₁. Providing more than one engagement location is advantageous as this avoids a displacement or turning of the envelope E₁ with regard to the conveying direction.

FIG. 7 shows yet another embodiment of a possible gripper conveyor comprising two belts or chains 604 a and 604 b arranged on both sides of the filling path so that an envelope is transported there between. The gripper elements 606 a and 606 b, other than in the embodiments of FIGS. 5 and 6, do not engage with the leading edge 608, but with two opposed lateral edges 610 a, 610 b of the envelope E₁, advantageously a position close to the leading edge 608.

In the embodiments described so far the envelope was placed on the envelope conveyor such that its flap is positioned on the envelope conveyor. However, the principles of the inventive approach may also be applied for inserters in which the envelope is held such that the side not having the flap is moved by an envelope conveyor. In such a configuration the lateral filling fingers operating independent of the envelope transport can also be used. FIG. 8 shows a schematic representation of an embodiment allowing the positioning of the envelope such that when the envelope is open the flap is arranged away from the envelope transport. In FIG. 8, the envelope transport 100 is shown which may be formed of a suction transport that was described with regard to FIGS. 1 and 2. The separating device 400 having basically the same structure as described with regard to FIGS. 1 and 2 is used in accordance with this embodiment to engage with flap F₁ of the envelope E₁ and is moveable at the same speed as the envelope so that the separating element 402 maintains the flap F₁ open during the filling process. Other than in FIGS. 1 and 2, the goods transport 200 is placed at a different position and with a different orientation, more specifically the goods transport is provided upside down when compared to the positioning in FIG. 1 so that the pusher 202 a does not collide with the flap F₁ held open by the element 402. Except for the different placement of the envelope, the different arrangement of the goods conveyor and the different functionality of the separating device, the functionality of the inserter as shown in the embodiment of FIG. 8 is the same as the functionality of the inserter as described with regard to FIGS. 1, 2 and 3.

It is noted that an embodiment has been described above, however, not all of the described elements are necessitated in accordance with the teachings of the present invention. Rather, in accordance with an embodiment, an apparatus for inserting one or more goods G₁ to G₄ into a moveable cover E₁ to E₃ comprises the cover transport 100 and at least one separating device 400 configured to engage with a first part of the cover E₁ to E₃ and to maintain the first part of the cover E₁ to E₃ separate from a second part of the cover E₁ to E₃ during at least a part of the movement of the cover E₁ to E₃.

A further embodiment of the filling aid 300 will now be described with reference to FIG. 9 which is a schematic top view of the inserter similar to the one in FIG. 1, except that the filling aid 300 is realized in accordance with another embodiment of the invention. Those elements already described with regard to FIG. 1 have associated therewith the same reference signs, but are not described again. The filling aid 300 comprises a first conveyor 302 comprising a rail 340 having two bent portions 340 a, 340 b that are connected by respective straight portions 340 c, 340 d. The straight portions 340 c, 340 d are arranged in parallel to each other. The straight portion 340 c is arranged at a side of the conveyor 302 facing the envelope transport 100, and the straight portion 340 d is provided on the side of the conveyor 302 facing away from the envelope transport 100. The first bent or curved portion 340 a is arranged at a position ahead of the start of the filling path, i.e. further upstream when compared to the start of the filling path, and the second bent or curved portion 340 b is arranged behind the end of the inserting path, i.e. further downstream in the transport direction F when compared to the end of the filling path. A plurality of filling aid elements or filling fingers 310′ are provided which are removably mounted to the rail 340. Each of the filling fingers 310′ is individually movable along the rail 340, e.g. the filling fingers 310′ may be self-propelled. The filling fingers 310′, like in FIGS. 1 to 3, are moved at least partially into an envelope. Each of the filling fingers 310′ may be moved and controlled individually. At the left-hand part of the conveyor 302 a number of filling fingers is shown in a waiting position. As soon as a new envelope is fed towards the filling path, the most forward filling finger is moved in accordance with the principles of the invention for supporting the inserting process as described above. The filling aid 300 comprises a second conveyor 304 having the same structure as the first conveyor 302. The conveyor comprises a rail 342 having two bent portions 342 a, 342 b connected by respective straight portions 342 c, 342 d. A plurality of filling aid elements or filling fingers 320′ are provided and may be moved independently of each other along the rail 304.

The embodiment of FIG. 9 is advantageous as an individual control of the respective filling fingers 310′, 320′ is possible so that, for example, a depth by which the respective fingers 310′, 320′ intrude into the interior of the envelope E₁ can be controlled easily. More specifically, an individual control for each of the envelopes to be filled is possible and, for example, on the basis of the goods to be inserted an insertion depth may be selected. Otherwise, the functionality of the filling aid depicted in FIG. 9 corresponds to the functionality of the filling aid described above. The placement of the filling fingers inside the envelope will now be described with reference to FIG. 9(a) and FIG. 9(b), schematically showing the placement of the filling fingers inside the envelope for a thin insert (see FIG. 9(a)) and for a thick insert (see FIG. 9(b)).

FIG. 9(a) is a schematic view of a portion of the inserter as it is shown in FIG. 2 or in FIG. 9. An insert G₁ having a thickness d₁ is supplied to the inserter. The filling finger 310 has been placed inside the envelope E₁ such that the throat of the envelope E₁ is arranged about half way up the inclined part of the upper part 310 b of the filling finger (see the position of the hinge line HL). Thereby, the throat of the envelope E₁ is opened by h₁ (the opposite faces of the envelope E₁ at the hinge line are separated by the distance h₁). This distance h₁ is sufficient to allow secure and reliable inserting of the insert G₁ into the envelope. It is not necessitated to fully open the envelope (fully placing the filling finger into the envelope).

In FIG. 9(b) the insert G₁ has a thickness d₂ which is greater that the thickness in FIG. 9(a), i.e. the insert is thicker. In this case, the filling finger 310 has been placed inside the envelope E₁ such that the throat of the envelope E₁ is arranged about all the way up the inclined part of the upper part 310 b of the filling finger (see the position of the hinge line HL). Thereby, the throat of the envelope E₁ is opened by h₂, which is greater than the distance h₁ in FIG. 9(a). This distance h₂ allows reliable and secure inserting of the insert G₁ into the envelope by fully opening the envelope (fully placing the filling finger into the envelope). As can be seen from a comparison of FIG. 9(a) and FIG. 9(b) this may be achieved by moving the filling finger 310 by different distances along the transport direction of the insert/envelope. More specifically, in case of FIG. 9(a) the filing finger 310 is moved to a position x₁ along the transport direction. In FIG. 9(b) the filing finger 310 is moved further down along the transport direction to a position x₂, thereby being placed deeper inside the envelope E₁. Different opening distances may be achieved by moving the filing finger such that a position upstream or downstream of x₁ is reached.

It is noted that the placement of the filling fingers inside the envelope as described with respect to FIG. 9(a) and FIG. 9(b) may be achieved by filling aids described in FIG. 1 and FIG. 9.

In the following the functionality of the filling aid fingers at the beginning of the filling process will be described on the basis of FIG. 10 showing an enlarged view of a front part of the filling path of the inserter of FIG. 1. FIG. 10(a) is a schematic top view, and FIG. 10(b) is a sectional view taken along line b-b′. FIG. 10 shows the situation at the beginning of the filling or inserting process. The envelope E₁ has already been engaged by the envelope transport 100. The goods pusher 202 a move the goods G₁. The filling fingers 310, 320 have passed the rollers 306, 316 halfway so that at the position shown in FIG. 10(a) a longitudinal extension of the filling fingers 310, 320 is substantially perpendicular to the envelope transport direction F (along which the envelope E₁ and the goods G₁ are transported). The filling fingers 310, 320 are mounted to the belts or chains 308, 318 by respective connecting parts 310 d, 320 d. In accordance with embodiments the filling fingers may be removably mounted to the respective belts 308, 318. The leading edge or end of the filling fingers is about to reach the hinge line HL of the envelope E₁. It is noted that in accordance with the inventive approach the filling process is a continuous process, i.e., the envelope E₁, the goods G₁ and the filling finger 310, 320 are moved continuously. As the respective fingers are moved they will complete their turn around the respective rollers 306, 316 and will enter into the envelope E₁ prior to the goods G₁ so that the goods G₁ are guided by the respective filling fingers 310, 320. As is shown in FIG. 10(b) the filling finger 310 comprises the above described lower part 310 a and the upper part 310 b connected by the wall part 310 c, thereby defining a space between the upper and lower parts 310 a, 310 b for accommodating the goods G₁ on their way into the envelope E₁.

FIG. 11 shows the filling process at a position downstream from the position in FIG. 10. Again, FIG. 11(a) is a top view, and FIG. 11(b) is a view taken along line b-b′ in FIG. 11(a). The envelope transport 100 moves the envelope E₁ with a first velocity, and the goods transport 200 moves the pusher 202 a and thereby the goods G₁ with a velocity faster than the velocity by which the envelope E₁ is moved. Thus, as both the envelope E₁ and the goods G₁ travel down the inserting or filling path, the goods starts to “overtake” the envelope. The envelope is opened so that the goods are inserted into the envelope. The filling fingers 310, 320 are arranged such that their leading edges have been moved into the envelope E₁ and the goods G₁ are guided into the envelope by means of the filling fingers 310, 320, thereby avoiding any collisions with the envelope E₁. As mentioned above, the filling fingers 310, 320 are driven independently of the envelope transport 100 at a speed that is equal to or slower than the speed of the envelope conveyor 100; the filling fingers 310, 320 do not cause any transport of the envelope E₁. Also, the lateral distance of the filling fingers 310, 320 is only defined by the dimension of the goods G₁ to be inserted, but not by the lateral dimension of the envelope E₁.

FIG. 12 shows a situation even further down the filling path where the filling process has been completed. Again, FIG. 12(a) is a top view, and FIG. 12(b) is a sectional view taken along line b-b′. As can be seen, the envelope E₁ reached the end of the filling path and the goods G₁ are completely inserted into the envelope E₁, i.e. they reached the envelope bottom at a leading edge of the envelope E₁. Further, the suction portion 104 ₁ of the envelope transport 100 is now in an area into which the vacuum chamber 114 does not extend, so that the transport of the envelope E₁ by the envelope transport 100 ceases. The further transport of the filled envelope E₁ is provided by the goods transport 200 still engaging by means of the pushers 202 a, 202 b the goods G₁. Further, since the goods transport 200 operates at a speed faster than the filling aid transport 302, 312, the filled envelope E₁ is drawn off the filling fingers 310, 320.

As far as FIGS. 10, 11 and 12 are concerned, it is noted that these figures were described on the basis of the embodiment depicted in FIG. 1, however, the same functionality may be achieved when using the filling aid of the embodiment of FIG. 9.

FIG. 13 shows yet another embodiment of the filling aid. In FIGS. 1 and 9 the filling aid was arranged on the lateral sides of the filling path, however, the invention is not limited to such embodiments. Rather, as is shown in FIG. 13(a), the filling aid may be arranged above the filling path. Again, the filling aid 300 comprises two conveyors 302, 304 arranged on the lateral sides of the filling path, i.e. on both sides of the envelopes E₁, E₂ transported along the filling path. FIG. 13(b) shows further details of the filling aid conveyor 302, which comprises the rollers 304, 306 around which the chain or belt 308 extends to which the respective filling fingers 310 are mounted. Contrary to the embodiments described so far, the first and second conveyors 302, 304 are not arranged in a plane that is parallel to the plane or level in which an envelope is transported, rather, the conveyors 302 and 304 are arranged perpendicular to the plane in which the envelopes travel. More specifically, the conveyor 302 is arranged such that the belt 308 extends on a lower side adjacent to the filling path for moving the filling finger 310 in the envelope transport direction F, whereas an upper part is distant from the plane in which the envelopes are transported. Still, as can be seen from FIG. 13(a), the conveyors 302, 304 are provided on the opposite lateral sides of the filling path to avoid interference with the other transports, e.g. the separating device transport and the goods transport. The functionality provided by the filling aid 300 in accordance with the embodiment shown in FIG. 13 is the same as the functionality described above with regard to FIGS. 1 to 3 and 9 to 12, except that instead of the lateral insertion of the filling fingers into the envelope as described above the filling fingers 310, 320 are moved into the envelope from above.

As mentioned above, the filling fingers in accordance with the inventive approach are only for guiding the one or more goods to be inserted into an envelope without causing a transport of the envelope. Therefore, it is not necessitated to set the distance of the opposing filling fingers dependent on the envelope, thereby avoiding the above mentioned problems with regard to the tolerances of such envelopes. Rather, in accordance with the inventive approach, the filling fingers are only adjusted dependent on the goods to be inserted. This is described in further detail with regard to FIGS. 14 and 15. FIG. 14 shows a first envelope E₁ having a first width w₁, and FIG. 15 shows a second envelope E₂ having a second width w₂, wherein the second width w₂ is greater than the first width w₁. The goods to be inserted in FIGS. 14 and 15 are considered to be the same and to have the same dimensions. As can be seen from a comparison of FIGS. 14 and 15, the filling fingers 310, 320 are maintained at the same position (see the lines l₁ and l₂ in FIGS. 14 and 15) despite the fact that the width w₁ of the first envelope E₁ is smaller than the distance between the two lines l₁ and l₂ while the width w₂ of the envelope E₂ corresponds to the distance between the lines l₁ and l₂. Thus, the position of the filling fingers 310, 320 only depends on the dimension of the goods G₁, but not on the dimensions of the envelope E₁ and E₂, thereby avoiding the problems with conventional approaches that used the filling fingers also for transporting the envelope. For example, when considering FIG. 15, in a conventional approach it would have been necessitated to increase the distance between the filling fingers 310, 320 to allow for the transport of the envelope E₂, however, the goods G₁ would not be properly guided in such a situation, thereby increasing the probability of filling errors. In addition, the above mentioned problems regarding the tolerances of the envelopes are avoided.

In the following, further embodiments of the separating device will be described with reference to FIGS. 16 to 22. FIG. 16 shows an initial situation of the filling process, where the envelope E₁ is already transported by the envelope transport 100, however, the goods G₁ have not yet reached the hinge line HL of the envelope E₁. The separating claw 402 has passed three quarters of the roller 406 of the separating device transport. The claw 402 has a claw main body 402 a and a claw tip 402 b. The claw tip 402 b protrudes in the transport direction F from the claw body 402 a. In accordance with embodiments, the claw tip 402 b may be flexible for avoiding damaging of the envelope upon entering it. FIG. 17 shows that the envelope E₁, the goods G₁ and the claw 402 have been moved further in the transport direction F when compared to FIG. 16. The claw 402 has completely passed the roller 406 and the claw tip 402 b engages with the inside of the upper side of the envelope E₁. Also, the goods G₁ have been further moved towards the envelope opening now held open by the claw tip 402 b. The goods G₁ have been moved across the elevation 108 of the suction belt 102 thereby securely passing over the flap F₁ of the envelope E₁ that is held on the suction portion 104 ₁ of the suction belt 102. Thus, the goods G₁ are raised above the plane in which the flap F₁ is arranged so that the goods G₁ can securely pass the flap without colliding with it.

In FIG. 18 the envelope E₁, the goods G₁ and the claw 402 have been moved further along the filling path. The separating claw 402 is moved together with the envelope E₁, advantageously at the same speed as the envelope, thereby maintaining the upper side of the envelope E₁ separated from the lower side during the transport of the envelope E₁. In FIG. 18 it is shown that the leading edge of the goods G₁ has reached the throat opening of the envelope E₁ and has been partially inserted.

FIG. 19 shows that the filling process is almost completed, i.e., the goods G₁ reached the bottom or leading edge of the envelope E₁. As described above, the goods transport 200 moves the goods G₁ at a velocity that is higher than the velocity by which the envelope E₁ and also by which the claw 402 of the separating device is moved so that, eventually, the pusher 202 a overtakes the claw 402 as shown in FIG. 19. Also the suction belt 102, more specifically the suction area 104 ₁, has almost reached the end of the vacuum chamber 114.

FIG. 20 shows that the filling process has been completed and transport of the filled envelope E₁ has been taken over by the goods transport 200, more specifically the filled envelope E₁ is pushed out of the filling path by the pushers 202 a of the goods transport 200 still in an engagement with the goods G₁. The envelope has been transported by means of the suction belt to a position beyond the vacuum chamber so that transport of the envelope E₁ by the transport 100 ceases and the envelope is moved with the higher speed of the goods transport 200 towards an output. This, at the same time, the envelope is drawn off the claw 402 of the separating device as this device is operated at a speed that is equal to or slower than the speed of the transport 100.

So far the separating device has been described as comprising the separating claw, however, the invention is not limited to such embodiments. For example, as shown in FIG. 21, instead of the claw a suction element 402′ may be provided that acts onto the outer surface of the envelope E so that it is maintained in its open position due to the suction force.

In accordance with further embodiments the separating element 402, for example the claw, may be configured such that upon moving around the roller 406, the separating element tip reaches a position in or below the level in which the envelope is transported so that the lower side of the envelope is pressed downwards which may be desired for more reliably separating the upper and lower sides of the envelope from each other. FIG. 22 schematically depicts such an embodiment. As can be seen, the tip 402 b of the separating element 402 is structured to extend by a distance from the main body 402 a so that upon rotating about the roller 406, the tip 402 b is either in the transport level or a little bit below the transport level of the envelope E (see FIG. 22(a)) thereby pressing the envelope downwards for easier opening of the envelope. Once the separating element 402 completed its turnaround the roller 406, its tip 402 b is raised above the level of the envelope E again, so that the lower side of the envelope and the upper side of the envelope are separated from each other (see FIG. 22(b)).

Instead of structuring the separating element 402 in way as shown in FIG. 22 it is also possible to provide a separating element 402 that is mounted to the transport 408 in such a way that prior to entering into the envelope E it is moved to the first position below the envelope transport level as shown in FIG. 22(a) and, after having been inserted into the envelope, it is retracted to the second position above the plane in which the envelope is transported. For example, appropriate means may be provided for allowing such a functionality, for example actuators for vertically moving the elements between the two positions. Also respective guide elements may be arranged along the part of movement so that in the beginning the element “dives” to the first position and then returns to the second position.

In the following, embodiments of the flap holder will be described with reference to FIGS. 23 to 29. Embodiments will be described in which the inserter, in addition to the above-described elements, further comprises a flap holder configured to cover an envelope flap during at least a part of the movement of the envelope and to maintain the envelope flap and one or more moving goods to be inserted into the envelope separated from each other. FIG. 23 shows a top view of the inserter as is it is shown in FIG. 1. In addition, a flap holder 700 is provided, while the other elements correspond to those which have been described with regard to FIG. 1. The flap holder 700 comprises four parallel flap holder elements 702 a-702 d. The flap holder elements 702 a-702 d may be formed of sheet-metal springs or spring plates and extend along the transport direction F. The flap holder 700 is arranged at the beginning of the filling path, so that an envelope, for example envelope E₁ which is moved into the filling path is arranged beneath the flap holder. As the envelope is inserted into the filling path, the flap holder, initially, covers an envelope body and, during the further movement of the envelope, covers the envelope flap. The one or more goods to be inserted are arranged above the flap holder 700, so that in a transfer region at the beginning of the filling path, the flap holder 700 is arranged between an envelope and the one or more goods.

The flap holder elements are arranged on both sides of the envelope transport 100, more specifically, the flap holder elements 702 a and 702 b are arranged in a portion between the envelope transport 100 and the first filling aid conveyor 302. Further, the flap holder elements 702 a and 702 b are arranged such that the pusher 202 a of the goods transport 200 is at a position between the envelope transport 100 and the inner flap holder element 702 b. The flap holder elements 702 c and 702 d are arranged in a similar way on the other side of the envelope transport 100, i.e. they are arranged between the second filling aid conveyor 312 and the envelope transport 100, wherein the pusher 202 b of the goods transport is at a position between the inner flap holder element 702 c and the envelope transport 100.

The functionality of flap holder 700 is such that upon entering the filling path, the envelope and the goods are separated from each other. The envelope is transported by the envelope transport 100 along the transport direction F and, in accordance with embodiments, the flap of the envelope is held on the transport belt, for example by a suction force applied. Thus, the center part of the envelope flap is held on the transport, so that the goods can pass the flap in this portion without any collisions. However, in the portions between the envelope transport 100 and the filling aid conveyors 302, 312 the flap, prior to inserting the filling aids is not held, so that the flap may raise from the transport level and a collision with the goods to be inserted may occur. Alternatively or in addition, the corners of the leading edge of the goods may hang down also resulting in a collision. Therefore, at the start of the filling process, the flap holder 700 is provided for covering the flap in those regions where the flap is not held, so that in the transfer area where the goods pass the flap, a separation between the flap and the goods is ensured, thereby allowing for a reliable filling process.

It is noted that the invention is not limited to the use of a suction belt as an envelope transport. In case another kind of transport is used which does not provide for a holding of the flap, an additional flap holder element may be provided between the flap holder element 702 b and 702 c.

In FIG. 23 an embodiment has been described comprising four or five flap holder elements. It is noted that the inventive approach is not limited to such embodiments, rather, more than four or five flap holder elements or less than four flap holder elements may be used. FIG. 24(a) shows an embodiment in accordance with which six flap holder elements 702 a-702 f are provided. The flap holder elements are arranged in a similar way as shown in FIG. 23, however, in addition between the outer flap holder 702 a in FIG. 23 and the first filling aid conveyor 302 a first additional flap holder element 702 e is arranged. Between the outer flap holder element 702 d on the other side of the center line C of the envelope E and the second filling aid conveyor 312 in FIG. 23 a further second flap holder element 702 f is arranged.

FIG. 24(b) shows another embodiment comprising only two flap holder elements 702 b and 702 c, flap holder elements 702 a and 702 d have been omitted.

The number of flap holder elements may be selected dependent on the format of the goods and envelopes to be processed by the inserter and/or by the characteristics of the goods/inserts. For example, goods/envelopes of the same format, but having a different stiffness may necessitate the use of more or less flap holder elements. For example, the stiffer the material of the goods/envelopes, the less bending is to be expected and the less flap holder elements are needed.

FIG. 25 shows an embodiment using stationary flap holder elements. FIG. 25 shows the different stages of one or more goods transferring or passing an envelope flap while using a flap holder. In FIG. 25(a) an initial situation is shown in which an envelope E₁ has been fed to the envelope transport. The surface 502 is shown in FIG. 25(a) that may be formed of a plate or one or more stripes and which extends up to a position X towards the beginning filling path (see the leading edge 502 a). Goods on their way to the filling path move above the surface 502, and an envelope is fed to the filling path from beneath passes the leading edge 502 a of the surface 502. The flap holder element 702 a has a leading edge 704 which extends in the transport direction F beyond the position X. As the envelope E₁ is moved into the inserting path, the leading edge 704 contacts the envelope body 706. The goods G₁ to be inserted into the envelope E₁ arrive and a leading edge 708 of the goods G₁ is arranged on a trailing edge 710 of the flap holder element 702 a. Thus, in FIG. 25(a) an edge of the Flap F1 has already reached the position X while the goods did not yet reach this position. Since the goods and the envelope are continuously moved, this situation results in a generation of a gap g between the edge of the flap and the leading edge of the goods, as is shown in FIG. 25(b). This gap is more likely to occur the shorter the flap is. To avoid collisions between the goods and the flap, the flap holder is provided which is arranged such that it spans the gap and, thereby maintains the goods and the envelope separated. In FIG. 25(b) the envelope E₁ and the goods G₁ have been moved further and, for example, by means of an air nozzle 500 the envelope E₁ has been opened so that the envelope's upper side 712 is separated from the envelope's lower side 714, to which the flap F₁ is attached. The flap holder element 702 a may be formed from a sheet-metal spring or a spring loaded plastic element which is biased in a direction of the envelope E₁, however, the flap holder element 702 a is dimensioned such that upon opening the envelope throat 716 the leading edge 704 of the flap holder element 702 a is also raised, i.e. the flap holder elements 702 a allows the opening of the envelope E₁. In FIG. 25(c) the envelope E₁ and the goods G₁ have been moved further down the transport direction F so that due to the further movement the leading edge 704 of the stationary or fixed flap holder element 702 a is no longer in contact with the upper side 712 of the envelope body, but is only in contact with the flap F₁. Due to the resilient nature of the flap holder element 702 a it deflects downward onto the flap F₁ after leaving the upper side 712. The goods G₁ already reached the envelope throat 716 and the flap holder element 702 a is arranged between the flap F₁ and the goods G₁, thereby allowing for a secure transfer of the goods G₁ across the flap F₁ without any collisions between the goods G₁ and the flap F₁ in the transfer area depicted in FIG. 25.

FIG. 26 describes another embodiment of the flap holders which may be provided movable. To be more specific, the flap holders may be moved at least partially along the transport direction F together with the goods and the envelope to ensure that during this movement the envelope flap is contacted by the flap holder and that the flap holder separates the flap and the goods. FIG. 26(a) shows an initial situation similar to FIG. 25(a) where an envelope E₁ has been received in the filling path and the goods G₁ arrive at the filling path. The flap holder element 702 a is movable along the transport direction F as is shown by the arrow 718. In FIG. 26(a) a first position of the flap holder element 702 a is shown in which the leading edge 704 is in contact with F₁ of the envelope E₁ that has been inserted into the filling path. The goods G₁ which arrive at the filling path are in contact with the flap holder element 702 a that is arranged between the goods G₁ and the flap F₁. In FIG. 26(b) the envelope E₁ and the goods G₁ have been moved further down the filling path. Also, the flap holder element 702 a, which is movable, has been moved further down in the filling direction so that the contact of the leading edge 704 and the flap F₁ is maintained during the movement from the position shown in FIG. 26(a) and the position shown in FIG. 26(b). The leading edge of the goods G₁ has reached the leading edge 704 of the flap holder element which separates the goods G₁ from the flap F₁. In FIG. 26(b) the leading edge of the goods G₁ has already passed the trailing edge of the flap F₁ so that the goods G₁ can now pass the flap F₁ without any collisions and can be securely and reliably inserted into the envelope E₁, which has been opened by appropriate means, for example, by blow air provided by nozzles. In FIG. 26(c) the goods G₁ and the envelope E₁ have been moved further along the transport direction F. Since the leading edge of the goods G₁ has already passed securely the trailing edge of the flap F₁, the flap holder element 702 a is retracted from the second position shown in FIG. 26(b) back towards the first position shown in FIG. 26(a) as is schematically shown by the arrow 720.

So far, stripe-shaped flap holders have been described. The invention is not limited to such embodiments, rather, the flap holders may have any suitable shape. FIG. 27 shows a flap holder in accordance with another embodiment of the invention. The flap holder elements 702 g and 702 h are provided which have an rectangular or an elliptical shape and which can be rotated between a first position shown in FIG. 27(a) and a second position shown in FIG. 27(b). In the first position the short axis of the plates 702 g, 702 h extends substantially along the transport direction, and the long axis of the plates 702 g, 702 h extends substantially perpendicular to the transport direction. In this position the flap F of the envelope is not covered, i.e., there will be a gap between the goods and the envelope edge. Upon rotating the plates 702 g, 702 h into then position shown in FIG. 27(b) the short axis of the plates 702 g, 702 h extends substantially perpendicular to the transport direction, and the long axis of the plates 702 g, 702 h extends substantially along the transport direction so that the leading edges of the plates 702 g, 702 h cover the flap.

In the embodiments depicted so far, flap holder elements were described which extended by the same distance across the envelope and/or the envelope flap. However, the invention is not limited to such embodiments, rather, dependent on the characteristics of the envelope opening some flap holder elements may extend further onto the envelope as others. Such an embodiment is now described with regard to FIG. 28. The flap holder in the embodiment of FIG. 28 comprises six flap holder elements of which only flap holder elements 702 a, 702 b and 702 e (see for example FIG. 24(a)) are shown. The envelope E₁ has an opening 716 being deeper at the center of the envelope E₁ and decreasing towards the outer edges of the envelopes. The flap holder elements 702 a, 702 b and 702 e are provided such that the respective leading edges of the flap holder elements are arranged at different end positions along the transport direction F, for example, the larger the opening 716 is, the further the flap holder elements extend onto the envelope E₁.

To allow for the handling of different kinds of envelopes, the flap holder elements may be arranged adjustable, as is indicated by the respective arrows shown in FIG. 28. For example, in case of a stationary flap holder, the respective flap holder elements may be provided with or connected to drives which allow for the adjustment of the leading edges of the flap holder elements dependent on the characteristics of the envelope, for example, the way it is shown in FIG. 28, advantageously prior to the start of an inserting job. In case of movable flap holder elements as described with regard to FIG. 26, the drive or motor provided for moving the flap holder elements between the first and second positions may be controlled such that at the second positions one flap holder element is positioned further down the transport direction F than other flap holder elements.

In accordance with another embodiment of the invention shown in FIG. 29, the flap holder may comprise flap holder elements 702 b, 702 c which can travel together with the envelope along the filling path, like the filling fingers of the filling aid. A circulating conveyor 730 is provided which comprises two belts 732 a, 732 b to which the flap holder elements 702 b, 702 c are mounted so that after completing the filling process and removing the envelope from the filling path, the flap holder elements 702 b, 702 c can be returned to the starting position. Advantageously, along the circulating conveyor a plurality of flap holder elements are provided for allowing the handling of one or more envelopes along the filling path.

Further, although the flap holder elements are shown to be spaced at the same intervals in the lateral direction (lateral to the transport direction F), it is noted that the intervals may be different, e.g. dependent on the characteristics of the goods and/or envelopes.

In the following, further embodiments of the invention will be described. More specifically, in the embodiments described so far the filled envelope is transported by the pushers of the goods transport, however, the present invention is not limited to such an implementation. For example, when the goods to be inserted comprise a low number of elements, e.g. only one or two sheets, or when the goods are not stiff or not rigid, a reliable transport of the envelope by the goods transport may not be possible or may be difficult (e.g. necessitate a reduced speed which, in turn, reduces the throughput). Goods may be deformed or damaged by the pusher. Further, the change in the transport speed of the envelope due to the goods transport taking over transport of the filled envelope may be critical because the filled envelope may be displaced (this may also happen when filling sufficiently stiff or rigid goods into the envelope). To avoid such problems, embodiments of the invention comprise a further envelope transport causing the transport of the filled envelope.

FIG. 30 shows an embodiment comprising such an additional envelope transport, wherein FIG. 30(a) is a schematic top view, and FIG. 30(b) is a sectional view taken along line b-b′. In FIG. 30 an inserter similar to the one of FIGS. 1 and 2 is shown. Elements of the inserter already described with respect to FIGS. 1 and 2 have associated therewith the same reference signs as used in FIGS. 1 and 2 and will not be described again. In addition to the envelope transport 100 used for transporting the envelope while inserting the goods, an additional envelope transport 800 is provided. The additional envelope transport 800 is arranged parallel and partially overlapping with the transport 100. The additional envelope transport 800 is arranged between the transport 100 and the first conveyor 302 of the filling aid 300. The additional envelope transport 800 comprises a suction belt 802 having first portions 804 ₁ and 804 ₂ where the suction belt 802 is provided with openings so that a suction force can be applied by a vacuum mechanism provided beneath the suction belt 802 to an object (e.g. a filled envelope) arranged on the suction belt 802. Further, the suction belt 802 comprises second portions 806 ₁, 806 ₂, 806 ₃ between the first portions 804 ₁ and 804 ₂ where no holes are provided so that in this part of the suction belt no suction force is applied to an object arranged thereon. Further, in FIG. 30(a) portions 807 a of the additional envelope transport 800 are hatched and portion 807 b is not hatched. In portions 807 a of the transport 800 no vacuum force is applied towards the belt 802, and in portion 807 b of the transport 800 a vacuum force is applied towards the belt 802. Thus, when the first portions 804 ₁ and 804 ₂ of the belt 802 pass portion 807 b a suction force is applied to the envelope on the belt 802 so that the envelope is transported by the additional envelope transport 800.

As can be seen from FIG. 30(b), the additional envelope transport 900 comprises a first, driven roller 910 and a second roller 812 around which the suction belt 802 extends. The envelope transport 800 further comprises a vacuum chamber 814 that is arranged in portion 807 b of the transport 800 and extends partly between the rollers 810 and 812 for applying the suction force to the sections 804 of the suction belt as the respective sections 804 are moved across the vacuum chamber 814. The vacuum chamber 814 extends from the roller 812 along the conveying direction F towards the roller 810, however, the vacuum chambers 114 and 814 of the trans-ports 100 and 800 do not overlap.

Once the envelope is filled it will no longer be transported by the transport 100. At this time, the filled envelope reached a position where it will be transported by the additional transport 800 with a velocity equal to or faster than the velocity of the goods transport. Thus, the filled envelope will be transported by the additional transport 800 thereby avoiding the above mentioned problems when transporting the filled envelope by the pushers of the goods transport. By means of the additional envelope transport 800 and the envelope transport 100 along the filling path a continuous transport or conveyer for the envelope is provided for reliably transporting the filled envelope to the output transport or the inserter output. The change in the transport speed of the envelope is not a problem because it occurs by transporting the filled envelope by the additional envelope transport 800, i.e. the envelope—during the further transport—is held by the transport elements of the additional envelope transport 800. This avoids undesired movements of the envelope or the like and thus allows for a reliable transport of the filled envelope towards the inserter output.

It is noted that in accordance with embodiments the inserter may be controlled such that dependent on the goods to be filled into an envelope the transport of the filled envelope may be caused by the goods transport 200 or by the additional envelope transport 800. For example, when it is determined that thin goods are to be filled into an envelope the additional envelope transport 800 may be activated. In case of inserts being sufficient rigid the additional envelope transport 800 may be deactivated so that the filled envelope is transported by the goods transport 200.

The additional envelope transport 800 may transport the filled envelope with a velocity higher than the transport 100 and higher than a velocity of the filling aid 300 so that the filled envelope will be removed from the filling fingers (see envelope E₃).

In the embodiment of FIG. 30 the additional envelope transport 800 is provided for transporting the filled envelope to an output transport 506 for moving a filled envelope towards an output of the inserter as is for example shown in FIG. 3(a). Alternatively, the additional envelope transport 800 may extend further in the transport direction to the output of the inserter (where the filled envelope is transferred to a subsequent station like a metering device, a sorter etc.). In this case, the additional envelope transport 800 also forms the output transport 506 of the inserter.

FIG. 31 shows another embodiment of the additional envelope transport 800. In this embodiment, the additional envelope transport 800 is arranged between the transport 100 and the second conveyor 312 of the filling aid 300. Otherwise, the embodiment of FIG. 31 corresponds to the one of FIG. 30.

FIG. 32 shows yet another embodiment of the additional envelope transport 800. In this embodiment, the additional envelope transport 800 comprises a first suction belt 802 a arranged between the transport 100 and the first conveyor 312 of the filling aid 300 and a second suction belt 802 b arranged between the transport 100 and the second conveyor 312 of the filling aid 300. The belt 802 a corresponds to the one of FIG. 30, and the belt 802 b corresponds to the one of FIG. 31. Using two belts may be advantageous to avoid a rotational movement of the filled envelope and to maintain its orientation during transport.

Instead of the above described suction transport comprising the suction belt also other transports for realizing the additional envelope transport are possible, e.g. a belt transport or one or more suction rollers.

In the following, further embodiments of the filling aid will be described. More specifically, in the embodiments described so far the filling aid comprises the conveyors for moving the filling fingers at least partly along the filling path together with the envelope. However, the present invention is not limited to such embodiments. It is sufficient to provide the filling fingers such that they are present until the goods have passed the hinge line of the envelope. FIG. 33 shows a schematic representation of an alternative embodiment for realizing the filling fingers. As can be seen, no conveyor is provided, rather, the filling fingers 310, 320 are arrange movable (back and forth) along the direction indicated by the arrow. When the envelope E₁ is supplied to the filling path, the filling fingers 310, 320 are in a rest or standby position which may be upstream of the filling path entrance. Once the envelope was supplied to the filling path the filling fingers 310, 320 are moved in the transport direction to be moved at least partly into the envelope. Once the goods G₁ passed the hinge line of the envelope E₁ the filling fingers 310, 320 may be retraced to their standby position until a new envelope has been supplied. As can be seen from FIG. 33, no filling fingers are in the envelope E₂ during the further filling process. The standby position of the filling fingers 310, 320 may be different from the above mentioned position. For example, the standby position may be at the sides of the filling path, and the filling fingers 310, 320 may be arranged rotatable to be moved from the standby position into the filling path and into the envelope and back into the standby position. Alternatively, the standby position of the filling fingers 310, 320 may be above or below the filling path.

Further, it is noted that embodiments may be provided that allow the handling only one envelope at a time, i.e., only one envelope is arranged along the filling path. In such an embodiment the envelope transport may extend all the way through the filling path to the output transport or the inserter output so that the unfilled and the filled envelope is transported by the same transport. The goods transport will operate at a higher velocity than the envelope transport until the envelope is filled. After filling is complete the goods transport may be decelerated (alternatively the envelope transport may be accelerated) for releasing the goods from the goods transport.

In the embodiments described so far the goods are transported faster than the envelope so that the goods will be filled into the opened envelope. The present invention is not limited to such embodiments. In accordance with another embodiment the envelope may be trans-ported faster than the goods so that the goods will be filled into the envelope. For example, when considering an inserter as shown in FIG. 1 and FIG. 2, the transport elements are modified to allow for the transport of the envelope and the goods from the right to the left (i.e. the transport direction F is opposite to the one shown in FIG. 2). The envelope is opened and when starting to overtake the “slower” goods the envelope is moved over the goods (i.e. the goods are received inside the envelope).

As can be seen from the embodiments described above, in accordance with the inventive approach an apparatus for inserting one or more goods into a moveable envelope is described. However, while the embodiments have been described on the basis of goods and envelopes comprising flaps, it is noted that the invention is not limited to such embodiments. Rather, the inventive approach is applicable to any kind of cover that is provided for receiving one or more goods therein. The cover and the goods are both moved during the inserting process and the filling aid is provided in a way as described above. In accordance with embodiments, the cover conveyor is arranged opposite to the goods conveyor and engages the cover at at least two locations or along a position of the cover. For example instead of the number of openings in the suction belt, one or more slits extending in the longitudinal direction of the belt may be provided. The at least two locations may be arranged consecutively along the cover transport direction or lateral to the cover transport direction. The elongated position may also be along the transport direction or lateral thereto. Further, in accordance with embodiments the respective drives of the different conveyors/transports are independent of each other so that each of the drives may be driven using individual driving and velocity curves. Instead of the suction belt and the gripper transport also conveyor using a pusher or a slider may also be used. While it has been mentioned above that the goods transport operates at a speed equal to or less than the speed of the cover transport, it is noted that the filling aid conveyors may be operated at a velocity that is independent of the velocity of the transport.

Although some aspects have been described in the context of an apparatus, it is clear that these aspects also represent a description of the corresponding method, where a block or device corresponds to a method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or item or feature of a corresponding apparatus.

While this invention has been described in terms of several advantageous embodiments, there are alterations, permutations, and equivalents which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and compositions of the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention. 

The invention claimed is:
 1. An apparatus for inserting one or more goods into a moving envelope, comprising: an envelope transport that continuously moves an envelope along a filling path, the envelope including a first side with an envelope flap and a second side opposite to the first side; at least one pair of movable filling fingers arranged at a distance defined by the one or more goods and arranged to be inserted into an opening of the envelope, such that when the one or more goods are to be inserted into the envelope, the at least one pair of movable filling fingers laterally guide the one or more goods into the envelope without moving the envelope; and at least one separating device configured to engage with the second side of the envelope and to move together with the envelope during at least a part of the envelope's movement for maintaining the second side of the envelope separate from the first side of the envelope during at least a part of the movement of the envelope, wherein the separating device is configured to move along at least a section of the filling path in a direction along which the envelope and the one or more goods are moveable along the filling path so as to engage with the second side of the envelope as the envelope moves; the filling path extends in an envelope transport direction and a goods transport direction; the opening of the envelope extends in a direction that is perpendicular to the envelope transport direction; and when the one or more goods are to be inserted into the envelope, the at least one pair of movable filling fingers are inserted into the envelope prior to the one or more goods.
 2. The apparatus of claim 1, wherein the separating device includes a conveyor to which one or more separating claws is mounted, wherein the conveyor is configured to move the one or more separating claws.
 3. The apparatus of claim 2, wherein at least two of the one or more separating claws are arranged consecutively along the conveyor.
 4. The apparatus of claim 1, wherein the separating device is configured to be moved with a velocity which is independent from a velocity at which the envelope is moved.
 5. The apparatus of claim 1, comprising an additional envelope transport configured to transport the filled envelope with a velocity higher than the envelope transport, higher than a velocity of the at least one pair of movable filling fingers, and/or higher than a velocity of a goods transport.
 6. The apparatus of claim 5, wherein the additional envelope transport comprises a suction transport.
 7. A method for inserting one or more goods into a moving envelope, comprising: continuously moving an envelope along a filling path, the envelope including a first side with an envelope flap and a second side opposite to the first side; inserting at least one pair of movable filling fingers arranged at a distance defined by the one or more goods into an opening of the envelope; moving the at least one pair of movable filling fingers together with the envelope, such that when the one or more goods are to be inserted into the envelope, the at least one pair of movable filling fingers laterally guide the one or more goods into the envelope without moving the envelope; and moving at least a separating device together with the envelope during at least a part of the envelope's movement for such that the separating device engages the second side of the envelope and holds the second side of the envelope separated from the first side of the envelope during at least a part of the movement of the envelope, wherein the separating device is moved along at least a section of the filling path in a direction along which the envelope and the one or more goods are moved along the filling path so as to engage with the second side of the envelope as the envelope moves; the filling path extends in an envelope transport direction and a goods transport direction; the opening of the envelope extends in a direction that is perpendicular to the envelope transport direction; and when the one or more goods are to be inserted into the envelope, the at least one pair of movable filling fingers are inserted into the envelope prior to the one or more goods.
 8. The method of claim 7, wherein the separating device is moved for opening the envelope so that the first side and the second side of the envelope are separated from each other.
 9. The method of claim 7, wherein the separating device is actively or passively removed from the envelope, wherein active removal of the separating device from the envelope comprises moving the separating device out of the envelope, swinging away the separating device or slowing down the separating device, and wherein passive removal of the separating device from the envelope comprises moving the envelope faster than the separating device.
 10. The method of claim 7, wherein, during holding the second side of the envelope, the separating device is moved with a velocity which is equal to or slower than a velocity by which the envelope is moved. 